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Network /
Misctxqueuelen: What would be "optimal" value for ppp0 device's txqueuelen, when it is used with HSDPA gsm modem for link which downlink speed is 1Mbit/s and uplink speed is 384kbit/s and ping ~80..100 ms? I would suggest using normal TCP calculation, i.e. that you dimension the txqueue size after the "BDP rule": bandwidth x delay product. Using your outbound numbers this is: 1,000,000 x 0.1 = 100,000 bits = 12,500 bytes. Assuming 1500 byte packets, this is txqueue = 12,500 / 1500 = 8.3 packets. So you could try txqueue size in the region 8-10, this should prevent queue starvation at packet drop events caused by traffic overload, even if you only have one single TCP flow. |